Current collector structure and battery pack

Abstract

Proposed in the present disclosure is a current collector structure, including a positive current collector, in which the positive current collector includes a current collector body and a current collector leading-out tab connected to each other; in which the current collector body is provided with a center underflow hole through the current collector body in a thickness direction thereof, and an entire surface of a surface of the current collector body in the thickness direction is a welding surface configured to weld with a positive tab of a winding core. Proposed in the present disclosure is also a battery pack including the aforementioned current collector structure.

1 . A current collector structure, comprising a positive current collector, wherein the positive current collector comprises a current collector body and a current collector leading-out tab connected to each other;
 wherein the current collector body is provided with a center underflow hole through the current collector body in a thickness direction thereof, and   an entire surface of a surface of the current collector body in the thickness direction is a welding surface configured to weld with a positive tab of a winding core.   
     
     
         2 . The current collector structure according to  claim 1 , wherein one or more of peripheral underflow holes are arranged at intervals along a perimeter of the current collector body at outer side. 
     
     
         3 . The current collector structure according to  claim 2 , wherein the current collector body is provided with an inner underflow hole in a thickness direction of the current collector body, and the inner underflow hole is arranged on a side of the center underflow hole. 
     
     
         4 . The current collector structure according to  claim 3 , wherein the welding surface of the current collector body is welded by laser screw welding or laser spot welding to form one or more of laser screw welds and one or more of laser spot welds. 
     
     
         5 . The current collector structure according to  claim 4 , wherein one or more of the laser screw welds form a screw welding outer boundary and a screw welding inner boundary, the screw welding outer boundary and the screw welding inner boundary are circular and provided concentrically with the center underflow hole, and a center of the inner underflow hole is located on the screw welding outer boundary; or
 one or more of the laser spot welds forms a spot welding outer boundary and a spot welding inner boundary, the spot welding outer boundary and the spot welding inner boundary are circular and provided concentrically with the center underflow hole, and a center of the inner underflow hole is located on the spot welding outer boundary.   
     
     
         6 . The current collector structure according to  claim 2 , wherein two surfaces of the current collector body in a thickness direction of the current collector body are provided with a protrusion and a groove correspondingly, the groove and the protrusion are aligned with each other and fit together in shape, the protrusion is arranged on a welding surface, and at least part of the protrusion extends to edges of the current collector body. 
     
     
         7 . The current collector structure according to  claim 6 , wherein one or more of the protrusions are provided and are in arc shapes, two ends of each of the protrusions extend to an edge of the current collector body to form a positive current collecting area around an edge part of the current collector body, and one or more of the peripheral underflow holes are provided at one or more of the positive current collecting areas correspondingly. 
     
     
         8 . The current collector structure according to  claim 1 , wherein the current collector body is provided with one or more of electrolyte positive electrode infiltration channels through the current collector body in the thickness direction thereof. 
     
     
         9 . The current collector structure according to  claim 8 , wherein one or more of the electrolyte positive electrode infiltration channels are distributed in an annular array centered on the center underflow hole; and
 an area between the center underflow hole and one or more of the electrolyte positive electrode infiltration channels is welded by laser screw welding or laser spot welding to form one or more of laser screw welds and one or more of laser spot welds.   
     
     
         10 . The current collector structure according to  claim 9 , wherein one or more of the laser screw welds form a screw welding outer boundary and a screw welding inner boundary, the screw welding outer boundary and the screw welding inner boundary are circular and provided concentrically with the center underflow hole, and one or more of the electrolyte positive electrode infiltration channels are provided outside the screw welding outer boundary; or
 one or more of the laser spot welds form a spot welding outer boundary and a spot welding inner boundary, the spot welding outer boundary and the spot welding inner boundary are circular and provided concentrically with the center underflow hole, and one or more of the electrolyte positive electrode infiltration channels are provided outside the spot welding outer boundary.   
     
     
         11 . The current collector structure according to  claim 8 , wherein two surfaces of the current collector body in a thickness direction of the current collector body are provided with a protrusion and a groove correspondingly, the groove and the protrusion are aligned with each other and fit together in shape, the protrusion is arranged on a welding surface;
 one or more of protrusions are provided and are in arc shapes, two ends of each protrusion extend to an edge of the current collector body, and one electrolyte positive electrode infiltration channel is provided between two adjacent protrusions.   
     
     
         12 . The current collector structure according to  claim 1 , further comprising a negative current collector, wherein the negative current collector is provided with an center solder joint set at a center of a surface in a thickness direction thereof, solder joints of the center solder joint set are distributed in at least two rows in a first direction, the solder joints in each row are distributed with an interval, and the solder joints in adjacent rows are misaligned. 
     
     
         13 . The current collector structure according to  claim 12 , wherein the negative current collector is provided with one or more of electrolyte negative electrode infiltration channels through the negative current collector in the thickness direction thereof. 
     
     
         14 . The current collector structure according to  claim 13 , wherein one or more of the electrolyte negative electrode infiltration channels are distributed in an annular array centered on the center solder joint set; and
 an area between two adjacent electrolyte negative electrode infiltration channels is welded by laser screw welding or laser spot welding to form one or more of laser screw welds and one or more of laser spot welds.   
     
     
         15 . A battery pack, wherein the battery pack comprises a current collector structure,
 the current collector structure comprising:
 a positive current collector, wherein the positive current collector comprises a current collector body and a current collector leading-out tab connected to each other; 
 wherein the current collector body is provided with a center underflow hole through the current collector body in a thickness direction thereof, and 
 an entire surface of a surface of the current collector body in the thickness direction is a welding surface configured to weld with a positive tab of a winding core. 
   
     
     
         16 . The battery pack according to  claim 15 , wherein one or more of peripheral underflow holes are arranged at intervals along a perimeter of the current collector body at outer side. 
     
     
         17 . The battery pack according to  claim 16 , wherein the current collector body is provided with an inner underflow hole in a thickness direction of the current collector body, and the inner underflow hole is arranged on a side of the center underflow hole. 
     
     
         18 . The battery pack according to  claim 17 , wherein the welding surface of the current collector body is welded by laser screw welding or laser spot welding to form one or more of laser screw welds and one or more of laser spot welds. 
     
     
         19 . The battery pack according to  claim 18 , wherein one or more of the laser screw welds form a screw welding outer boundary and a screw welding inner boundary, the screw welding outer boundary and the screw welding inner boundary are circular and provided concentrically with the center underflow hole, and a center of the inner underflow hole is located on the screw welding outer boundary; or
 one or more of the laser spot welds forms a spot welding outer boundary and a spot welding inner boundary, the spot welding outer boundary and the spot welding inner boundary are circular and provided concentrically with the center underflow hole, and a center of the inner underflow hole is located on the spot welding outer boundary.   
     
     
         20 . The battery pack according to  claim 16 , wherein two surfaces of the current collector body in a thickness direction of the current collector body are provided with a protrusion and a groove correspondingly, the groove and the protrusion are aligned with each other and fit together in shape, the protrusion is arranged on a welding surface, and at least part of the protrusion extends to edges of the current collector body.